Custom declarative source sync fails: "Failed to wait for exit value file /dest/exitCode.txt" - Both Cloud and Self-hosted

### Helm Chart Version

2.0.19

### What step the error happened?

During the Sync

### Relevant information

Environment:
- Airbyte Version: 2.0.1 (Self-hosted on Azure Linux VM)
- Airbyte Cloud: Also tested
- OS: Ubuntu 24.04

Description:
Custom YAML connector built using Connector Builder fails to sync
to any destination. Tried both Airbyte Cloud and self-hosted 2.0.1.

What we tried:
1. Custom YAML declarative source with JSONPlaceholder API
2. Multiple destinations tested:
- Azure Blob Storage
- End-to-End Testing (dev/null)
3. Airbyte Cloud (build-24075 and build-24078)
4. Self-hosted Airbyte 2.0.1 on Azure Linux VM (16GB RAM)

Error:
Failed to wait for exit value file /dest/exitCode.txt
Killing orchestrator because of an Exception
Streams without a status message: [posts]

Expected Behavior:
Data should sync from custom declarative source to destination.

Actual Behavior:
0 records extracted, 0 records loaded. Orchestrator crashes.

### Relevant log output

```shell
2026-02-20 22:51:27 platform INFO Writing output of 8b01f408-723f-4759-ad64-0715bdafbcaa_1771545600000_discover to the doc store
2026-02-20 22:51:27 platform INFO Marking workload 8b01f408-723f-4759-ad64-0715bdafbcaa_1771545600000_discover as successful
2026-02-20 22:51:27 platform INFO Deliberately exiting process with code 0.
2026-02-20 22:51:27 platform INFO
2026-02-20 22:51:28 platform INFO APPLY Stage: BUILD — (workloadId=ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync)
2026-02-20 22:51:29 platform INFO APPLY Stage: CLAIM — (workloadId=ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync)
2026-02-20 22:51:29 platform INFO Claimed: true for workload ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync via API in dataplane ea2eda3b-2f9b-4ca4-b990-3c8d551ea995 (f28f991b-a8b2-4926-b44d-3635bd48d18e)
2026-02-20 22:51:29 platform INFO APPLY Stage: LOAD_SHED — (workloadId=ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync)
2026-02-20 22:51:29 platform INFO APPLY Stage: CHECK_STATUS — (workloadId=ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync)
2026-02-20 22:51:29 platform INFO No pod found running for workload ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync
2026-02-20 22:51:29 platform INFO APPLY Stage: MUTEX — (workloadId=ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync)
2026-02-20 22:51:29 platform INFO Mutex key: ad25cf65-7e45-4680-b89b-a2ba7c61b3a8 specified for workload: ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync. Attempting to delete existing pods...
2026-02-20 22:51:29 platform INFO Mutex key: ad25cf65-7e45-4680-b89b-a2ba7c61b3a8 specified for workload: ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync found no existing pods. Continuing...
2026-02-20 22:51:29 platform INFO APPLY Stage: ARCHITECTURE — (workloadId=ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync)
2026-02-20 22:51:29 platform INFO APPLY Stage: LAUNCH — (workloadId=ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync)
2026-02-20 22:51:29 platform INFO [initContainer] image: airbyte/workload-init-container:2.0.1 resources: ResourceRequirements(claims=[], limits={memory=2Gi, cpu=1}, requests={memory=2Gi, cpu=1}, additionalProperties={})
2026-02-20 22:51:29 platform INFO Launching replication pod: replication-job-1-attempt-0 (selectors = {}) with containers:
2026-02-20 22:51:29 platform INFO [source] image: airbyte/source-declarative-manifest:7.10.1 resources: ResourceRequirements(claims=[], limits={memory=2Gi, cpu=1}, requests={memory=1Gi, cpu=0.5}, additionalProperties={})
2026-02-20 22:51:29 platform INFO [destination] image: airbyte/destination-dev-null:0.9.3 resources: ResourceRequirements(claims=[], limits={memory=2Gi, cpu=1}, requests={memory=1Gi, cpu=0.5}, additionalProperties={})
2026-02-20 22:51:29 platform INFO [orchestrator] image: airbyte/container-orchestrator:2.0.1 resources: ResourceRequirements(claims=[], limits={memory=2Gi, cpu=1}, requests={memory=2Gi, cpu=1}, additionalProperties={})
2026-02-20 22:52:07 platform INFO Attempting to update workload: ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync to LAUNCHED.
2026-02-20 22:52:07 platform INFO Pipeline completed for workload: ad25cf65-7e45-4680-b89b-a2ba7c61b3a8_1_0_sync.
2026-02-20 22:52:48 replication-orchestrator INFO Running replication worker...
2026-02-20 22:52:48 replication-orchestrator INFO Starting replication worker. job id: 1 attempt: 0
2026-02-20 22:52:48 replication-orchestrator INFO
2026-02-20 22:52:48 replication-orchestrator INFO ----- START REPLICATION -----
2026-02-20 22:52:48 replication-orchestrator INFO
2026-02-20 22:52:48 replication-orchestrator INFO Running destination...
2026-02-20 22:52:48 replication-orchestrator INFO Writing messages to protocol version 0.2.0
2026-02-20 22:52:48 replication-orchestrator INFO Reading messages from protocol version 0.2.0
2026-02-20 22:52:48 replication-orchestrator INFO Closing io.micronaut.context.propagation.instrument.execution.ContextPropagatingExecutorService@5fbbe7aa
2026-02-20 22:52:48 replication-orchestrator INFO Closing io.micronaut.context.propagation.instrument.execution.ContextPropagatingExecutorService@29911ee3
2026-02-20 22:52:48 replication-orchestrator INFO Closing io.airbyte.container.orchestrator.worker.io.LocalContainerAirbyteDestination@5ce4c15a
2026-02-20 22:53:49 replication-orchestrator WARN Failed to wait for exit value file /dest/exitCode.txt to be found.
2026-02-20 22:53:49 replication-orchestrator ERROR Error closing resource io.airbyte.container.orchestrator.worker.io.LocalContainerAirbyteDestination@5ce4c15a; recording failure but continuing.
2026-02-20 22:53:49 replication-orchestrator INFO Closing io.airbyte.container.orchestrator.worker.io.LocalContainerAirbyteSource@4d99d7ac
2026-02-20 22:53:49 replication-orchestrator INFO Closing io.airbyte.container.orchestrator.worker.RecordSchemaValidator@5722c149
2026-02-20 22:53:49 replication-orchestrator INFO Closing io.airbyte.container.orchestrator.persistence.SyncPersistenceImpl@58cb1f78
2026-02-20 22:53:49 replication-orchestrator ERROR Killing orchestrator because of an Exception
2026-02-20 22:53:50 platform INFO
----- START POST REPLICATION OPERATIONS -----

2026-02-20 22:53:50 platform INFO No post-replication operation(s) to perform.
2026-02-20 22:53:50 platform INFO
----- END POST REPLICATION OPERATIONS -----
```

---
**Internal Tracking:** https://github.com/airbytehq/oncall/issues/11382

### Connector YAML:
version: 7.0.4

type: DeclarativeSource

check:
type: CheckStream
stream_names:
- posts

streams:
- type: DeclarativeStream
name: posts
primary_key:
- id
retriever:
type: SimpleRetriever
record_selector:
type: RecordSelector
extractor:
type: DpathExtractor
field_path: []
requester:
type: HttpRequester
url_base: https://jsonplaceholder.typicode.com
path: /posts
http_method: GET
request_parameters:
_limit: "10"
paginator:
type: DefaultPaginator
page_token_option:
type: RequestOption
inject_into: request_parameter
field_name: _page
pagination_strategy:
type: PageIncrement
page_size: 10
start_from_page: 1

spec:
type: Spec
connection_specification:
type: object
$schema: http://json-schema.org/draft-07/schema#
required: []
properties: {}
additionalProperties: true

metadata:
testedStreams:
posts:
streamHash: ad11f9fa446b445a056b0f48d54e74059e0bc977

concurrency_level:
type: ConcurrencyLevel
default_concurrency: 1